You will get a diagnosed and fixed backend issue in your SaaS application
Top Rated
Project details
Is your SaaS application experiencing a backend bug, API failure, database issue, or unreliable background job?
I will investigate the problem, identify its root cause, and implement a reliable solution in your existing application.
Depending on the selected package, the service can include:
• Reviewing the relevant code, configuration, and logs
• Reproducing and diagnosing the issue
• Fixing backend logic, APIs, database queries, or background jobs
• Testing the implemented solution
• Providing a summary of the cause and changes
I work with Ruby on Rails, PostgreSQL, Redis, Sidekiq, REST APIs, JavaScript, Vue.js, Linux, webhooks, and third-party integrations.
Please contact me before ordering so I can review the issue and confirm the appropriate package.
I will investigate the problem, identify its root cause, and implement a reliable solution in your existing application.
Depending on the selected package, the service can include:
• Reviewing the relevant code, configuration, and logs
• Reproducing and diagnosing the issue
• Fixing backend logic, APIs, database queries, or background jobs
• Testing the implemented solution
• Providing a summary of the cause and changes
I work with Ruby on Rails, PostgreSQL, Redis, Sidekiq, REST APIs, JavaScript, Vue.js, Linux, webhooks, and third-party integrations.
Please contact me before ordering so I can review the issue and confirm the appropriate package.
Programming Languages
JavaScript, Python, Ruby/Ruby on RailsCoding Expertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included
| Service Tiers |
Starter
$150
|
Standard
$300
|
Advanced
$600
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
9 reviews
(9)
(0)
(0)
(0)
(0)
This project doesn't have any reviews.
IA
Ikechukwu A.
Jul 29, 2026
FirstPromoter API & Affiliate Tracking Integration - HermesSync
Shozab is an outstanding full-stack developer and a true technical partner. He successfully integrated FirstPromoter and custom coupon code logic into our Shopify application seamlessly. Beyond just executing task requirements, Shozab constantly looks out for the business, proactively building cost-saving architecture to protect our margins. His communication, technical problem-solving, and dedication to delivery are top-tier. I will definitely continue working with him on future milestones!
IA
Ikechukwu A.
Jul 28, 2026
Senior SaaS Developer: 8-Week Build for E-commerce Intelligence Platform (API Focused)
Shozab is hands down one of the most talented, reliable, and proactive full-stack developers I have worked with on Upwork. We brought him on to build HermesSync, a complex Shopify SaaS application, and he delivered exceptional results from concept to full approval on the Shopify App Store.
What truly sets Shozab apart is his ownership mindset. He doesn’t just write code to close tickets; he actively thinks like a product engineer. Throughout our build, he consistently identified ways to optimize backend architecture, protect our operational margins (such as building internal stats tracking to cut external API costs by 50%), and refine the UI/UX for mobile responsiveness.
Key Highlights of Working with Shozab:
• Deep Technical Expertise: Flawlessly handled complex integrations including Shopify GraphQL/Billing APIs, webhooks, custom AI data pipelines, and third-party affiliate tracking (FirstPromoter).
• Unmatched Problem Solver: Extremely thorough when debugging edge cases, mobile container CSS constraints, and data matching logic.
• Outstanding Communication & Reliability: Always transparent, responsive, and dedicated to meeting strict deployment deadlines.
If you need a top-tier developer who can take a complex software idea and turn it into a production-grade, high-converting product, hire Shozab immediately. I couldn't ask for a better development partner and am excited to continue working with him on our next phases!
What truly sets Shozab apart is his ownership mindset. He doesn’t just write code to close tickets; he actively thinks like a product engineer. Throughout our build, he consistently identified ways to optimize backend architecture, protect our operational margins (such as building internal stats tracking to cut external API costs by 50%), and refine the UI/UX for mobile responsiveness.
Key Highlights of Working with Shozab:
• Deep Technical Expertise: Flawlessly handled complex integrations including Shopify GraphQL/Billing APIs, webhooks, custom AI data pipelines, and third-party affiliate tracking (FirstPromoter).
• Unmatched Problem Solver: Extremely thorough when debugging edge cases, mobile container CSS constraints, and data matching logic.
• Outstanding Communication & Reliability: Always transparent, responsive, and dedicated to meeting strict deployment deadlines.
If you need a top-tier developer who can take a complex software idea and turn it into a production-grade, high-converting product, hire Shozab immediately. I couldn't ask for a better development partner and am excited to continue working with him on our next phases!
AB
Alexander B.
Oct 6, 2024
Build a minimal shopify site
JP
Javier P.
Jul 20, 2024
Shopify Developer for Design Implementation
I had an excellent experience working with Shozab. He was incredibly nice, easy to communicate with, and genuinely eager to do a great job. Shozab asked the right questions and showed a strong commitment to delivering high-quality work. It was a pleasure working with him, and I highly recommend his services!
AW
Angela W.
Feb 6, 2024
RoR + Vue.js expert needed
Great work! Shozab is very detail oriented.
About Shozab
Backend & SaaS Developer | APIs, AI Integrations, Automation
100%
Job Success
Lahore, Pakistan - 3:38 pm local time
I’m best suited to projects involving complex business logic, API integrations, background processing, automation, production debugging, or existing applications that need a reliable engineer—not simple brochure websites.
I can help you with:
• SaaS features and backend application development
• REST APIs and third-party integrations
• AI features integrated into existing applications
• Business workflow and process automation
• PostgreSQL database design and performance
• Background jobs, queues, retries, Redis, and Sidekiq
• Production debugging and application stabilization
• Chatwoot customization and messaging integrations
• Existing codebase maintenance and feature development
My core experience is with Ruby on Rails, Vue.js, PostgreSQL, Redis, JavaScript, APIs, Linux, and Git. I also work with AI APIs and automation tools when they provide a practical solution to a business problem.
Previous projects include:
• Improving backend reliability for a production SaaS platform with intensive background processing
• Developing and maintaining Ruby on Rails and Vue.js applications
• Building Chatwoot customizations, upgrades, automation, and WhatsApp integrations
• Connecting external services through APIs and webhooks
• Diagnosing and fixing issues in existing production systems
I’m comfortable entering an existing codebase, understanding how it works, identifying the actual problem, and delivering a maintainable solution.
Send me a description of the problem, your current technology stack, and the expected outcome. I’ll respond with relevant questions and a practical next step.
Steps for completing your project
After purchasing the project, send requirements so Shozab can start the project.
Delivery time starts when Shozab receives requirements from you.
Shozab works on your project following the steps below.
Revisions may occur after the delivery date.
Discussion
we'll discuss regarding the problem to come up with a solution that will suit you.
Implementation / coding
I'll write the code that will solve your problem.